Image of the continuum emission at 154 μm toward Oph-A. B-field vectors obtained from SOFIA/HAWC+ at 154 μm are shown in magenta solid segments. The green dashed arrows indicate the radiation directions from the Oph-S1 star toward the cloud. The white star marks the position of the Oph-S1 star. The red curve illustrates the elongated shape of the ridge in the dense cloud. The gray contours are the H₂ column density, with contour levels at (1, 2, 5, 10, 20)×l0²² cm⁻².